QEMU-based test environments

[Bruno Haible]

On 2023-11-12 I wrote:
> I've added info about how to get access to test environments here:
>   
> https://git.savannah.gnu.org/gitweb/?p=gnulib/maint-tools.git;a=blob;f=platforms/test-environments.txt
>   
> https://git.savannah.gnu.org/gitweb/?p=gnulib/maint-tools.git;a=tree;f=platforms/environments

Now, I have added more detailed instructions regarding QEMU-based test
environments:
  - A step-by-step procedure for how to create a QEMU-based environment, with
    as little trial-and-error as possible.
  - 38 examples of this procedure, for platforms ranging from Linux/alpha
    to NetBSD/sparc64.

The writeups are here:
  
https://git.savannah.gnu.org/gitweb/?p=gnulib/maint-tools.git;a=tree;f=platforms/environments

Thanks to René Rebe from the T2-SDE distribution for teaching me about the
Linux kernel option 'console=ttyS0', that is sometimes essential.

Bruno